Report on the zoological collections made in the Indo-Pacific Ocean ...

CRtrSTACEA. 305in some of its characters to conuect this genus with Cirolana ; it is atonce distinguished from R. orientalis by the form of the eyes, whichare confluent in the middle line of the head. Specimens are in theBritish-Museum collection from the north-eastern coast of Australia,but no special indication of locality remains, nor any record as tohow they were obtained.In Dr. Coppingcr's specimen, and in that from the Gulf of Suez,the front is somewhat more broadly rounded than in the figure ofSchiodte and Meinert- (Nat. Tidsskr. p. 395, pi. xiii. figs. 1-2, 1879).In the smaller specimens from Ceylon the antennae have a fewer(10-12) jointed flagellum. I doubt therefore the constancy of thenumber of the joints of the autennal flagellum as a character forseparating the species ; but not having examined specimens of severalof the new forms described by Schiodte and Meinert, I will notexpress myself upon this point with certainty.There is in the British-Museum collection a species of ^ga verynearly allied to ^c/a ci/chjjs, Haswell, from Port Jackson, but whichseems to be sufficiently distinguished by having the body very coarselypunctulatcd, the epimera of the fourth to seventh segments only subacuteand (the last excepted) scarcely prolonged beyond the posteriormargin of the segments ; and particularly bj' the form of the terminalpostabdominal segment, which is truncated, not rounded, at itsdistal extremity ; the outer ramus of the iiropoda is ovate but notacute, the inner squarely truncated at its distal extremity ; the distalprocess of the peduncle extends considerably beyond the middle ofthe inner ramus. This species, of which a single male is in the collectionfrom King George's Sound (i^. il/, i?ft?/}?er, H.M.S. Herald'),'I propose to designate ^f/a meinerti. In the confluent eyesand the form of the terminal segment it somewhat resemblesthe North-European and Arctic ^ga crenulata, Liitken, but theposterior prehensile limbs are without the cultriform process characteristicof that species and ^rja ivthhii.8. Cymodocea longistylis. (Plate XXXIII. fig. C.)Convex oblong-ovate, as usual in the genus. Head and first threesegments of the body indistinctly punctulated ; the fourth to seventhsegments granulated, the granules arranged in two transverse series,and most distinct on the two posterior segments. First segment ofthe postabdomen with a transverse line of granules (like those of thethoracic segments, but larger) and with other granules posterior toit, and with a prominence on either side of the middle line on itsposterior margin : terminal segment also very distinctly granulatedand somewhat hairy, and with two elevated prominences on itsupper surface, behind which, and near to the distal extremity, is amuch less elevated and more rounded prominence ; terminal notchquadrangular, and with an oblong distally truncated median lobe.The median frontal process is subtriangulate ; the postero-lateralangles of all the segments of the body are acute, except those of theX